package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.BtOperation;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * 菜品管理
 */
@Slf4j
@RestController
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {

        log.info("新增菜品：{}", dishDto.toString());

        dishService.saveWithFlavor(dishDto);

        // 可以选择清除所有缓存
//        Set keys = redisTemplate.keys("dish_*");
//        redisTemplate.delete(keys);

        // 清除对应分类菜品的缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_" + dishDto.getStatus();
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    /**
     * 菜品信息分页
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page<DishDto>> page(int page, int pageSize, String name) {

        // 构造分页构造器对象
        Page<Dish> pageInfo = new Page<>(page, pageSize);
        Page<DishDto> dishDtoPage = new Page<>(page, pageSize);

        // 条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        // 添加过滤条件
        queryWrapper.like(name != null, Dish::getName, name);
        // 添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        // 执行分页查询
        dishService.page(pageInfo, queryWrapper);

        // 对象拷贝
        BeanUtils.copyProperties(pageInfo, dishDtoPage, "records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item, dishDto);

            Long categoryId = item.getCategoryId();
            // 根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null)
                dishDto.setCategoryName(category.getName());

            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);

        return R.success(dishDtoPage);
    }

    /**
     * 根据 id 查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {

        DishDto dishDto = dishService.getByIdWithFlavor(id);

        return R.success(dishDto);
    }


    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {

        dishService.updateWithFlavor(dishDto);

        // 可以选择清除所有缓存
//        Set keys = redisTemplate.keys("dish_*");
//        redisTemplate.delete(keys);

        // 清除对应分类菜品的缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_" + dishDto.getStatus();
        redisTemplate.delete(key);

        return R.success("修改菜品成功");
    }

    /**
     * 根据条件查询对应的菜品数据
     * @param dish
     * @return
     */
    /*
    @GetMapping("/list")
    public R<List<Dish>> list(Dish dish) {

        // 构造条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        // 添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus, 1);
        // 添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        return R.success(list);
    }
    */

    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish) {
        List<DishDto> dishDtoList;

        // 动态构造 key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();

        // 先从 Redis 中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);

        if (dishDtoList != null) {
            // 如果Redis存在数据 直接返回    无需查询数据库
            return R.success(dishDtoList);
        }

        // 构造条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
        // 添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus, 1);
        // 添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            // 复制
            BeanUtils.copyProperties(item, dishDto);

            // 查询菜品对应的口味信息
            LambdaQueryWrapper<DishFlavor> dishFlavorLambdaQueryWrapper = new LambdaQueryWrapper<>();
            dishFlavorLambdaQueryWrapper.eq(DishFlavor::getDishId, item.getId());
            List<DishFlavor> dishFlavorList = dishFlavorService.list(dishFlavorLambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());

        // 如果Redis不存在数据 需要查询数据库 并将查询到的数据缓存到Redis中
        redisTemplate.opsForValue().set(key, dishDtoList, 60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }

    /**
     * 删除菜品信息
     * @param btOperation
     * @return
     */
    @DeleteMapping
    public R<String> deleteWithFlavor(BtOperation btOperation) {

        log.info("批量删除id：{}", btOperation.getIds());

        boolean res = dishService.deleteWithFlavor(btOperation);

        if (!res) return R.error("错误! 不能删除正在销售的菜品!");

        return R.success("删除成功！");
    }

    /**
     * 更新菜品状态
     * @param status
     * @param btOperation
     * @return
     */
    @PostMapping("/status/{status}")
    public R<String> updateStatus(@PathVariable int status, BtOperation btOperation) {

        log.info("修改状态为：{}, 被修改菜品的id：{}", status, btOperation);

        // 获取需要被修改状态的菜品的 id 信息
        List<Long> ids = btOperation.getIds();

        for (Long id : ids) {
            // 查询id对应的实体类信息
            Dish dish = dishService.getById(id);

            // 修改实体对应的状态
            dish.setStatus(status);

            // 对表中数据进行更新
            dishService.updateById(dish);
        }

        return R.success("更新成功！");
    }

}
